Declaration: void rectangle(int left, int top, int right, int bottom);
rectangle function is used to draw a rectangle. Coordinates of left top and right bottom corner are required to draw the rectangle. left specifies the X-coordinate of top left corner, top specifies the Y-coordinate of top left corner, right specifies the X-coordinate of right bottom corner, bottom specifies the Y-coordinate of right bottom corner. The code given below draws a rectangle.
C programming code for rectangle
#include<conio.h>
main()
{
int gd = DETECT, gm;
initgraph(&gd, &gm, "C:\\TC\\BGI");
rectangle(100,100,200,200);
getch();
closegraph();
return 0;
}